Moon Lake Dam Reservoir Report
Last Updated: December 5, 2025
Moon Lake Dam, located in Grimes County, Texas, is a privately owned Earth dam built in 1975 with a primary purpose of "Other." Standing at a height of 12 feet and spanning 680 feet in length, this dam has a storage capacity of 50 acre-feet and serves as a crucial structure on Floyds Creek.
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Summary
Despite being non-federally regulated, the dam is subject to state permitting and inspection, ensuring its safety and compliance with regulations.
With a risk assessment rating of "High (2)," Moon Lake Dam's hazard potential and condition assessment are not available, indicating a need for further evaluation and potential risk management measures. The dam does not have a spillway and is equipped with one outlet gate. The presence of associated structures, inspection dates, and emergency preparedness information is not readily available, highlighting the importance of continued monitoring and assessment to ensure the dam's safety and stability for water resource and climate enthusiasts in the area.
As a significant feature in the local water infrastructure, Moon Lake Dam serves as a reminder of the importance of maintaining and monitoring dams for water resource management and climate resilience. Its location in a high-risk area underscores the need for proactive risk management and emergency preparedness measures to mitigate potential hazards and ensure the safety of surrounding communities and the environment. Further data and assessments are needed to fully understand the dam's condition and potential risks, emphasizing the ongoing need for comprehensive dam safety practices in the region.
Year Completed |
1975 |
Dam Length |
680 |
Dam Height |
12 |
River Or Stream |
FLOYDS CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
12 |
Nid Storage |
50 |
Structural Height |
12 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
12 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Lake Ck Nr Dobbin
|
14cfs |
W Fk San Jacinto Rv Nr Huntsville
|
34cfs |
W Fk San Jacinto Rv Bl Lk Conroe Nr Conroe
|
262cfs |
Lake Ck At Sendera Ranch Rd Nr Conroe
|
101cfs |
Dry Ck At Fm 2978
|
2cfs |
Spring Ck Nr Tomball
|
35cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
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